4. Pulse or digital communications
  5. Repeaters
  6. Testing

Frank M. Perelman

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Modem employing pulse width modulation for data transmission

Pulse or digital communications – Repeaters – Testing
Patent

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Video telephone employing pulse width modulation for data transm

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent

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Profile ID: LFUS-PAI-P-431550

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